I'm flattered, but this is about you not me. There are a number of things to do to understand anatomy better. The best advice I could give you there would be to pay attention to examples, real life or not, and take good exercises with them when modeling.
When I was learning to make body proportions: I did a series of exercises of low-poly characters (give or take 1000 tris). Characters this low detail are easy to produce, and thus are great for exercise.
I actually learned faces first, since I figured it was the most detailed part. Again I got good at this just from a ton of low-poly exercise.
As Janro has stated, reference images can help a ton. And anything can be a reference image, it doesn't have to be your own sketch, it can be one from another, or even something as simple as an image found on google.
On a side note, to answer your post on youtube: I model like Japanese comics because it is just easier and funner for me then realistic. It's easier because there can be a lot more tolerances for when it looks "right" then when trying to do it realistically. And the way I did the eyes was just using normal bones and weight painting.
Four bones:
Inner eye: used for making blinking look right
Front eye: Can be used to make eyes angle down to make look angry
Top Eye: also used in blinking, can make character look tired.
Outer eye: used to slant eyes, good for making character look sad or surprised.
btw my face figure looks like this
